Anker has continued its inexorable march towards producing anything that includes a battery with the gargantuan PowerHouse electric “generator,” and you can save $100 on yours for a limited time.

I put “generator” in scare quotes because you can’t readily use the PowerHouse to generate electricity, unless you buy additional solar panels. Instead, it’s basically a gigantic lithium-ion battery that can power everything from mini-fridges to laptops to televisions to emergency medical equipment for hours on end.

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There are a few similar products on the market, most notably Goal Zero’s Yeti 400, but those use heavy lead-acid batteries (the Yeti weighs 29 pounds), rather than lithium-ion like the 9.3 pound PowerHouse.

I could see using this thing as an alternative to a noisy gas generator for tailgating, or you could just keep it charged and at the ready for power outages at home. It’s definitely an investment at its $500 list price, but for a limited time, it’s down to $400, matching its all-time low.